From what I have gathered, they aren't worth the expense and hassle on the 2L unless you are running over 400hp.
If you list some of your mods here and your goals for the car, I am sure we could give you some good suggestions.
If you do it yourself the total cost is less than 20 dollars in gaskets. It took me about 6 hours to do mine. About two hours removing and reinstalling the intake manifold and four doing the actual porting.
Here is my post from when I ported them. http://forums.nasioc.com/forums/showthread.php?t=883952 I am trying to dig up the charts that are missing in the last post.